Educational information, not medical advice — ask your doctor or midwife.
Macela is a small shrubby plant with tiny yellow flower heads. The dried flowers are brewed as a tea. In Latin American folk use, that tea was taken mainly for an upset stomach and belly cramps.
The plant grows wild across southern Brazil, Uruguay, Argentina and Paraguay. Local names include marcela, macela-do-campo and Brazilian everlasting. The flowers hold their shape and scent after drying, which is how the plant got that last name.
Here is the honest verdict up front. Almost everything known about macela comes from test tubes and animal work. Long use in a tradition is not proof that a plant works, and it is not proof that it is safe.
There are no good human trials behind the common claims. That does not mean macela does nothing. It means nobody has shown what it does in people.
No one has shown how macela works in the human body. The ideas below come from lab and animal studies only.
In test tubes, extracts of the flowers slow the release of some inflammation signals. In mice and rats, extracts have eased gut muscle spasms. Whether a cup of tea does that in a person is not known.
The plant is rich in flavonoids, a group of plant pigments. In cell studies these mop up reactive molecules called free radicals. Antioxidant activity in a dish often does not carry over to the body.
Animal studies have also looked at the liver. In rats given a liver toxin, macela extract appeared to reduce the damage. This has never been tested properly in people, so it should not be read as liver protection.
A few lab reports suggest the extract slows certain viruses and bacteria in culture. Those tests use strong extracts in a dish, not tea in a stomach.
In rodents, some extracts lowered blood sugar and blood pressure a little. That is one reason for the drug cautions further down this page. Take those findings as a reason for care, not as a proven effect.
Dried flower heads sold loose or in tea bags are the usual form. This is how the plant is taken across southern Brazil and Uruguay.
Other forms you may see:
Tinctures and liquid extracts in alcohol.
Capsules of powdered flower.
Bottled herbal digestive drinks that list macela among several herbs.
Home-made liqueurs, where the flowers are steeped in cane spirit.
Aromatic sachets and pillow fillings, a folk use rather than a medical one.
The essential oil is not a normal retail product. Do not swallow concentrated oil of any plant without a clinician's say-so.
Macela has deep roots in the folk medicine of the River Plate region and southern Brazil. Guarani people used the plant, and settler and gaucho communities carried the habit on.
The flowers were traditionally gathered in August, before the full bloom. Many families held that an August harvest made the tea stronger. Bunches were hung to dry and kept for the year.
The tea was taken after heavy meals for a sour or bloated stomach. It was also brewed for period pain, colds and restless sleep. Dried flowers were tucked into pillows and baby bedding for the scent.
Macela is still sold openly in street markets and herb shops across the region. It appears in Brazilian official lists of plants of interest to the health service. That listing reflects traditional standing and research interest, not proven benefit.
Stop macela and get urgent help if you develop a rash, facial or throat swelling, or trouble breathing.
Stop and see a doctor if you notice unusual bruising or bleeding, or if you feel shaky, sweaty and confused, which can mean low blood sugar.
Book an appointment rather than carrying on with the tea if:
Stomach pain, heartburn or bloating lasts more than two weeks.
You see blood in vomit or stool, or you are losing weight without trying.
Period pain is severe, new or getting worse.
Your skin or eyes look yellow, which can signal a liver problem.
In Brazil, macela is a recognised medicinal plant and appears on national lists used by the health service. It is sold freely as a herbal tea.
In the United States, the United Kingdom and the European Union it is sold as a food supplement or herbal tea. It is not approved as a medicine in those places, and no health claim is authorised.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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